Abstract
The objective of this work is to carry out a comparative study through the main factors (individual, breed, age and region) having a direct effect or by interaction on the physicochemical parameters of th milk produced by 3 types of cows, local (BLL), imported (BLI) and crossed (BLC) which are reared b the same extensive farming system in the western region of Algeria. A total of 88 dairy cows, 55 BLLs, 17 BLIs and 16 BLCs selected at the beginning of lactation were followed regularly for a period of three months (March to May). At the same time, milk samples are taken for each cow and then they are sent for analysis at the laboratory. The physicochemical parameters of milk analyzed as well as milk production showed a very varied degree of influence with respect to breed and age.
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